Is There a Debate on Which Party Has Shifted More?

The two parties are shifting further and further to the a extremes. We're not trying to change the system, because it would be fun; we're trying to actually see different results. The problem of primaries is exasperating the power of the anti democratic authoritarian strain in american politics. So i should think there's a menu of options that we should be looking all of which would be better than the current really bad system.